Improvement in atmospheric hammers



NITED STATES \VILLIAM MANSON, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN ATMOSPHERIC HAMMERS Specification forming paIt of LettersPatent No. 152,391, dated June 23, 12:74; application filed I April 27,1874.

To all whom it may concern:

Be it known that I, WILLIAM lVIANSON, of

. San Francisco city and county, State of California, have invented anImproved Atmospheric Hammer 5 and I do hereby declare the followingdescription and accompanying drawings are sufficient to enable anyperson skilled in the art or science to which it most nearly appertainsto make and use my said invention or improvement without furtherinvention or experiment.

The object of my invention is to provide an improved tool to be usedmore especially in any class of work which needs a series of percussiveblows, and which work is not easy to standing machinery and it consistsin the employment ofa cylinder having within it a 'piston which is movedby the action of a body of air contained within the cylinder, and

"alternately compressed before and behind the piston by acompressing-piston and cylinder with which it is connected. Through thehead, at one end of the cylinder, a stem passes, and the outer end ofthis stem contains a socket, into which any tool may be introduced. The

independent piston strikes the head of this of the piston.

stationary stem at each downward movement, and thus operates the toolwithout the latter being ever lifted from its work.

Referring to the accompanying drawing for a more complete explanation ofmy invention, Fig. l is a longitudinal section of the cylinder, showingthe piston and tool-holder. Fig. 2 is an enlarged view of the lowercylinderhead.

A is a long cylinder of small diameter, provided with twoheads, B B.\Vithin this cylinder the piston O is fitted to move, and an elasticcushion, D, may be inserted into the upper head to prevent shock fromthe stroke of the piston, although in practice sufficient air can beretained for this purpose by placing the supply-port a short distancefrom the end of the cylinder, so that the piston will pass it andcushion upon the air thus inclosed. The lower cylinder-head isperforated to receive the stem E, which carries the tool-holder F at itsouter end, and is provided with a suitable. head, G, at its inner end toreceive the stroke For convenience, the lower cylindenhead B may be madein two parts, so that after being removed from the cylinder it can beseparated to remove the stem E when necessary.

The tool-holder is fitted to receive any sort of tool which can beoperated by this moven1entsueh as drills, cold-chisels for cutting orchipping, or tamping-tools. The motive power for the piston will be theair contained above and below the. piston, and also above and below thepiston of the compressing-cylinder, with which it is connected by thepipes H H in a manner similar to that described in my former applicationfor Letters Patent. In the present case the pipes may be flexible, sothat the tool can be operated at any point and in any direction.

As the main compressing-eylinder may be used for many purposes, it willbe necessary to have some means of stopping this tool, whenever it isnecessary, without stopping the compressor. This is easily effected byplacing the lower pipe H a short distance above the end of the cylinder,so that when the stem drops down the piston G will pass far enoughbeyond the port to close it, and thus stop as soon as the cylinder islaid down.

The operation will be as followsz The cylinder A is taken in the hand,and the tool is held against its work, thus pressing the stem E backuntil the piston O is forced beyond the passage H, when it willinstantly begin its reciprocating movements, striking blows upon thehead of the tool, which need never be removed from its work. This isoften of considerable importance, as in the use of a cold-chisel, andthis is a point of great value in my invention.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s-

The piston 0, operating independently within the cylinder A, incombination with an independent stem and tool holder, E, moving throughone head ot'the cylinder, and provided with the head G for receiving theblows of the piston, substantially as and for the purpose described.

In witness whereof I have hereunto set my hand and seal.

\YILLIAM MANSON. [L. s.]

itnesses:

J OHN L. BOONE, C. M. RICHARDSON.

